An obnoxious feature of
Windows 98 is to briefly and mysteriously turn the tab-key into a running-application switcher.
Suddenly you can't tab any more--either to
indent text or to move among form fields. This feature can be activated
deliberately by keying "alt-tab", or accidentally, simply by using Windows for a while.
A related misfeature is for the backspace key to be suddenly mapped to the back function in IE5...